Apparatus And Methods For Disrupting Intervertebral Disc Tissue

ABSTRACT

An apparatus for disrupting tissue in the intervertebral disc space that includes a barrier member having a first configuration for insertion into the disc space and a second configuration when deployed within the disc space. The second configuration of the barrier member is adapted to at least partially define a perimeter of a working region within the disc space. The apparatus also includes a tissue disruption tool configured for insertion into the working region.

This application claims the benefit of U.S. Provisional Application No.62/021,960, filed Jul. 8, 2014, which is hereby incorporated herein byreference.

FIELD OF THE DISCLOSURE

The present disclosure generally relates to apparatus and methodsemployed in surgical procedures to disrupt tissue of a patient, and moreparticularly, to apparatus and methods that may be utilized in minimallyinvasive surgical procedures to prepare the intervertebral disc spacefor other procedures, such as implantation of prosthetics, by forming abarrier around selected tissue to be disrupted within the intervertebraldisc space.

BACKGROUND

A major cause of chronic, and often disabling, back pain is herniationor degeneration of an intervertebral disc. The spine is comprised ofbony vertebrae separated by intervertebral discs. Each intervertebraldisc connects adjacent vertebrae and forms a joint that allows movementof the vertebral column. An intervertebral disc is generally dividedinto two regions—the nucleus pulposus and the annulus fibrosus. Thenucleus pulposus is a gelatinous-like tissue that lies at the center ofthe disc and provides a cushion between adjacent vertebrae. The annulusis made up of collagen fibers that form concentric lamellae thatsurround and contain the nucleus pulposus.

There are many causes of intervertebral discs degeneration, which can bebroadly categorized as mechanical, genetic and biochemical. Mechanicaldamage includes herniation in which a portion of the nucleus pulposusprojects through a fissure or tear in the annulus fibrosus. Genetic andbiochemical causes usually result from changes in the biochemicalprocesses of a disc. Such changes can be attributed to genetic disordersor environmental influences. Degenerative disc condition is commonlycaused by a change in the biochemical process of an intervertebral disc.Such degeneration is a progressive process that usually begins with adecrease in the ability of the nucleus pulposus to absorb water. With aloss of water content, the nucleus becomes dehydrated, resulting in adecrease of internal disc hydraulic pressure, and ultimately to a lossof disc height. This loss of disc height can cause the annulus tobuckle, eventually resulting in annular fissures and ruptures.

Furthermore, disc height plays an important role in the functionality ofthe intervertebral disc and spinal column, and changes in disc heightcan have both local and wider effects. On the local (or cellular) level,decreased disc height may result in increased pressure in the nucleuspulposus, which can lead to a decrease in normal cell operation and anincrease in cell death and disintegration. In addition, increases inintra-discal pressure may create an unfavorable environment for fluidtransfer into the disc, which can cause a further decrease in discheight.

Decreased disc height also results in significant changes in the largermechanical stability of the spine. With decreasing height of the disc,the facet joints bear increasing loads and may undergo hypertrophy anddegeneration. Decreased stiffness of the spinal column and increasedrange of motion resulting from loss of disc height can lead to furtherinstability of the spine, as well as back pain.

Several disc defects may be treated by implantation of a prosthetic intothe nuclear space of the intervertebral disc. Some procedures that mayinclude insertion of a prosthetic into the disc are spinal fusion anddisc repair and replacement. Prior to implantation of most prosthesis, adiscectomy is often performed to prepare the nuclear space forimplantation of the prosthetic and, when spinal fusion is desired, tofacilitate bony fusion between the vertebral bodies. Some implantationprocedures may require a total discectomy in which the majority (andusually all) of the volume of the nucleus pulposus is removed. Othersmay require a partial discectomy in which only a portion of the nucleuspulposus is removed.

Traditionally, discectomy procedures are performed with the use ofsimple manual instruments, such as curettes, which are cupped scraperswith a variety of end configurations, pituitary rongeurs, which are jawlike gripping or cutting members, and rasps, which include a roughsurface that is employed to roughen and scrape endplate tissue ofadjacent vertebrae. For a typical posterior surgical approach, anincision is made through the back of a patient and access to the discspace is achieved. The manual instruments are then inserted through theaccess to the intervertebral disc requiring treatment. The curettes androngeurs are used to cut, tear, and remove nucleus pulposus tissue onepiece at a time, and the rasps are utilized to roughen or scrape theendplates of adjacent vertebrae.

There are some significant limitations associated with performing adiscectomy with these manual instruments. For example, since the disctissue is cut and removed a piece at a time, dozens of repeated cyclesof insertion and removal of the traditional instruments are required toremove the desired amount of tissue. The repeated cycles increase therisk of associated nerve damage and the amount of trauma to thesurrounding tissue. Additionally, guidance of the traditionalinstruments is largely controlled by the dexterity of the surgeon, andeven with the most skilled surgeons, repeated precise placement of suchinstruments is a challenge. Furthermore, because of the geometricconfiguration of traditional instruments and the limited work spaceassociated with intervertebral disc procedures, it can be difficult toadequately remove the required amount of material from the nuclearspace. This is particularly the case with a unilateral (one of the morepreferred) access of the disc space, where the contralateral half of thedisc is significantly more difficult to reach. Finally, surgeonstypically use traditional instruments without being able to see thetissue being removed. Thus, the surgeon must be able to distinguishnucleus tissue from annulus tissue and bone tissue by “feel.” Thus, ifthe surgeon has a difficult time distinguishing between these tissues,serious damage can be done to the annulus of the disc or the vertebralbodies.

Other methods and techniques have been developed for performingdiscectomy procedures. However, these methods and techniques also havelimitations and risks associated with their use. Accordingly, thereremains a need for improved discectomy devices and methods.

SUMMARY OF DISCLOSURE

The present disclosure provides devices and methods for disruptingtissue within an intervertebral disc space. The devices and methods mayinclude use of a barrier member that isolates tissue to be disruptedfrom other adjacent or surrounding tissue. The barrier member isinserted into the intervertebral disc space and defines a perimeter ofworking region which may include tissue selected for disruption.Optionally, the barrier may be inserted under fluoroscope or othervisual aid prior to insertion of disruption tools. With the barrier inplace, the risk of unintentional disruption of tissue adjacent to theworking region is reduced. While such a barrier may be used in anyprocedure in the disc space, it may be particularly useful inpercutaneous minimally invasive procedures wherein the surgeon haslimited visibility of the treatment site and is disrupting tissue byfeel because the barrier provides a boundary between the working regionand other surrounding or adjacent material.

In one aspect, the present disclosure is generally directed to anapparatus for disrupting tissue in the intervertebral disc space thatincludes a barrier member having a first configuration for insertioninto the disc space and a second configuration when deployed within thedisc space. The second configuration of the barrier member at leastpartially defines a perimeter of a working region within the disc space.The apparatus also includes a tissue disruption tool that is insertioninto the working region.

In another aspect, a method for disrupting tissue in the intervertebraldisc space includes forming a barrier in the intervertebral disc spacewherein the barrier at least partially defines a perimeter of a workingregion within the disc space and disrupting tissue within the workingregion.

In yet another aspect, an apparatus for disrupting tissue in theintervertebral disc space includes an elongated member including adistal end portion having an arcuate configuration when unstressed. Theelongated member is substantially straightened for insertion into thedisc space and assumes the arcuate configuration when inserted into theintervertebral disc space. In the disc space, the elongated memberdefines a perimeter of a working region. The apparatus also includes atissue disruption tool configured to be inserted into the workingregion.

In a further aspect, an apparatus for disrupting tissue in theintervertebral disc space includes a first elongated member including adistal end portion having a substantially linear configuration forinsertion into the intervertebral disc space and is configured to changeto a curved configuration within the disc space to form a barrier thatat least partially surrounds disc tissue to be disrupted. The apparatusalso includes a second elongated member including a distal end portionwherein the distal end portion of the second elongated member includes atissue disruptor configured to be inserted into the working region.

In yet another aspect, an apparatus for protecting tissue within theintervertebral disc space includes an elongated member having a distalend portion sized and configured to be deployed into the intervertebraldisc space through a percutaneous access. The distal end portion of theelongated member has a curved configuration, when deployed within theintervertebral disc space, which forms a barrier that isolates tissueselected for disruption from selected other tissue, such as selectedannulus fibrosis tissue.

In yet another aspect, a tissue disruption tool includes a firstelongated shaft having a proximal end portion and a distal end portionand a second elongated shaft having a proximal end portion and a distalend portion and extending generally parallel to the first elongatedshaft. The tool also includes a first jaw pivotally attached to thedistal end portion of the first elongated shaft and a link pivotallyattached to the distal end portion of the second elongated shaft. Thetool includes a second jaw being pivotally attached to the link and tothe first jaw. The first and second shafts are relatively linearlymovable to move the first and second jaws between a first configurationrelatively in-line with respect to the elongated shafts and a secondconfiguration extending at an angle relative to the shafts.Additionally, one of the jaws may be biased to the second configuration.

BRIEF DESCRIPTION OF THE FIGURES

In the course of this description, reference will be made to theaccompanying drawings, wherein:

FIG. 1A is a side view of a vertebral column;

FIG. 1B is a perspective view of an intervertebral disc and itsassociated inferior vertebra;

FIG. 2A is a top view of one embodiment of a tissue disruption apparatusin accordance with the present disclosure and shown accessing the anintervertebral disc space;

FIG. 2B is a top view of the tissue disruption apparatus of FIG. 2Ashown with the distal end portion of the elongated member deployedwithin the intervertebral disc space to define a working region and atissue disruption tool partially deployed within the working region;

FIG. 3 is a top view of the tissue disruption apparatus of FIG. 2A shownwith the distal end portion of the elongated member and the tissuedisruption tool deployed within the intervertebral disc space;

FIG. 4A is a perspective view of one embodiment of an elongated memberthat forms a barrier in accordance with the present disclosure;

FIG. 4B is a perspective view of another embodiment of an elongatedmember that forms a barrier in accordance with the present disclosure;

FIGS. 5-7 are perspective views of different configurations of tissuedisruptors that may be associated with the distal end portion of thetissue disruption tool;

FIGS. 8A and 8B are top views of one embodiment of a tissue disruptiontool in accordance with the present disclosure;

FIG. 9 is a top view of another embodiment of a tissue disruption toolin accordance with the present disclosure;

FIG. 10A is a perspective view of one embodiment of a tissue disruptionapparatus in accordance with the present disclosure;

FIG. 10B is a cross-sectional view of the tissue disruption apparatus ofFIG. 10A;

FIG. 10C is an end elevational view of the tissue disruption apparatusof FIG. 10A;

FIG. 11 is an enlarged partial perspective view of the distal endportion of the tissue disruption apparatus shown in FIG. 10A.

FIG. 12 is a perspective view of the tissue disruption apparatus of FIG.10A shown with the elongated member in the deployed position;

FIG. 13 is a perspective view of another embodiment of a tissuedisruption apparatus in accordance with the present disclosure;

FIG. 14 is a perspective view of another embodiment of a tissuedisruption apparatus in accordance with the present disclosure;

FIG. 15 is a perspective view of another embodiment of a tissuedisruption apparatus in accordance with the present disclosure;

FIG. 16 is a perspective view of one embodiment of a obturator inaccordance with the present disclosure;

FIG. 17A is a perspective view of the tissue disruption apparatus ofFIG. 10A shown with the obturator of FIG. 16 inserted therethrough;

FIG. 17B is an enlarged cross-sectional view of the proximal end portionof the housing of the tissue disruption apparatus shown in FIG. 17A;

FIG. 18 is a perspective view of another embodiment of a tissuedisruption tool of the present disclosure;

FIG. 19 is an enlarged perspective view of the distal end portion of thetissue disruption tool of FIG. 18;

FIG. 20 is a perspective view of the distal end portion of the tissuedisruption tool of FIG. 18 shown in the extended/deployed position;

FIG. 21 is a cross-sectional view of the tissue disruption tool takenalong lines 21-21 of FIG. 18;

FIG. 22 is a perspective view of the tissue disruption tool of FIG. 18shown with the protector located over the tissue disruptor;

FIG. 23 is an enlarged perspective view showing the distal end potion ofthe tissue disruption tool of FIG. 18 shown with the protectorpositioned over the tissue disruptor;

FIG. 24 is an enlarged cross-sectional view of the distal end portion ofthe tissue disruption tool taken along lines 24-24 of FIG. 23;

FIG. 25 is a perspective view of another embodiment of a tissuedisruption tool in accordance with the present disclosure;

FIG. 26 is an enlarged perspective view of the distal end portion of thetissue disruption tool of FIG. 25;

FIG. 27A is a cross-sectional view of the tissue disruption apparatus ofFIG. 10A shown with the elongated member in the extended or deployedconfiguration and a tissue disruption tool partially deployed into theworking region defined by the elongated member;

FIG. 27B is a partial cross-sectional view of the proximal end portionof the housing of the tissue disruption apparatus of FIG. 27A;

FIG. 27C is a perspective view of the distal end portion of the tissuedisruption apparatus of FIG. 27A shown with the elongated member in theextended or deployed configuration and a tissue disruption toolpartially deployed into the working region defined by the elongatedmember;

FIG. 28A is a perspective view of the distal end portion of the tissuedisruption apparatus of FIG. 27A shown with the elongated member in theextended or deployed configuration and the tissue disruption tooldeployed within the working region;

FIG. 28B is a top view of the tissue disruption apparatus of FIG. 28Ashown deployed within an intervertebral disc space;

FIGS. 29 and 30 are cross-sectional views of another embodiment of atissue disruption tool in accordance with the present disclosure;

FIG. 31 is a perspective view of the distal end portion of the tissuedisruption tool of FIG. 29 shown with the tissue disruptor partialextended;

FIGS. 32-34 are perspective views of different configurations of tissuedisruptors that may be associated with a tissue disruption tool of thepresent disclosure;

FIGS. 35-40 are perspective views of different embodiments of tissuedisruptors that may be associated with a tissue disruption tool of inaccordance with the present disclosure;

FIG. 41 is a top view of a tissue disruption apparatus shown with theelongated member and the tissue disruption tool in their respectivedeployed configurations;

FIGS. 42 and 43 are perspective views of a tissue disruption apparatusschematically shown contacting and disrupting superior and inferiorendplate tissue, respectively;

FIG. 44 is a perspective view of a tissue disruption apparatus shownwith the elongated member and the disruption tool in their respectivedeployed configurations;

FIG. 45 is a perspective view of a tissue disruption apparatus shownwith the elongated member and the disruption tool in their respectivedeployed configurations;

FIG. 46 is a perspective view of one embodiment of a tissue disruptiontool in accordance with the present disclosure;

FIGS. 47-49 are enlarged top views of the distal end portion of thetissue disruption tool of FIG. 46 showing actuation of the jaws;

FIG. 50 is a cross-sectional view of the distal end portion of thesurgical instrument taken along lines 50-50 of FIG. 49;

FIG. 51 is a cross-sectional view of the distal end portion of thetissue disruption tool taken along lines 51-51 of FIG. 49;

FIG. 52 is a partial perspective view of the distal end portion of thetissue disruption tool of FIG. 46;

FIGS. 53 and 54 are perspective views of another embodiment of a tissuedisruption tool in accordance with the present disclosure;

FIGS. 55 and 56 are perspective views of another embodiment of a tissuedisruption tool in accordance with the present disclosure;

FIGS. 57 and 58 are perspective views of another embodiment of a tissuedisruption tool in accordance with the present disclosure;

FIGS. 59 and 60 are perspective views of a tissue disruption toolincluding an actuator for moving the position of the tissue disruptor;

FIG. 61 is a top view of another embodiment of a tissue disruption toolin accordance with the present disclosure;

FIG. 62 is a top view of the distal end portion of the tissue disruptorof FIG. 61;

FIG. 63 is a side view of another embodiment of a tissue disruption toolin accordance with the present disclosure;

FIG. 64 is a side view of the tissue disruption tool of FIG. 63 shownwith the jaws in an open configuration and a portion of the handle cutaway;

FIG. 65 is a side view of the tissue disruption tool of FIG. 63 shownwith the jaws in a closed position;

FIG. 66 is a side view of the tissue disruption tool of FIG. 63 shownwith the jaws in a closed position and the distal end portion in asubstantially straight configuration;

FIGS. 67A-67C are partial side views of one embodiment of the jaws ofthe tissue disruption tool of FIG. 63;

FIGS. 68 and 69 are partial side views of another embodiment of jaws ofthe tissue disruption tool of FIG. 63;

FIG. 70 is a side view of another embodiment of a tissue disruption toolin accordance with the present disclosure;

FIG. 71 is a perspective view of another embodiment of a tissuedisruption tool in accordance with the present disclosure;

FIG. 72 is a perspective view of another embodiment of a tissuedisruption tool in accordance with the present disclosure;

FIG. 73 is a perspective view of another embodiment of a tissuedisruption tool in accordance with the present disclosure;

FIGS. 74-77 are cross-sectional views of exemplary profiles of thetissue disruption tools of FIGS. 72 and 73;

FIG. 78 is a perspective view of another embodiment of a tissuedisruption tool in accordance with the present disclosure;

FIGS. 79 and 80 are cross-sectional views of exemplary profiles of thetissue disruption tool of FIG. 78;

FIGS. 81-83 are side views of exemplary profiles of the tissuedisruption tool of FIG. 78;

FIG. 84 is a perspective view of another embodiment of a tissuedisruption tool in accordance with the present disclosure;

FIG. 85 is a perspective view of another embodiment of a tissuedisruption tool in accordance with the present disclosure;

FIG. 86 is a cross-sectional view taken along lines 86-86 of FIG. 85;and

FIGS. 87 and 88 are side views of other embodiment of tissue disruptiontools in accordance with the present disclosure.

DETAILED DESCRIPTION

The tissue disruption apparatus, tools and methods of the presentdisclosure may be utilized in any number of surgical procedures todisrupt (cut, scrape, brush, puncture, tear, grasp, extract, remove,etc.) tissue of a patient, but are particularly well suited forperforming endoscopic discectomy procedures and preparing intervertebraldiscs for prosthetic implantation and spinal fusion. For example, suchapparatus, tools and methods may be utilized in minimally invasiveprocedures that are conducted through an access port that has a diameterof between about 0.2 inches (5 mm) and about 1.2 inches (30 mm), and istypically between about 10 mm and about 12 mm. The tissue disruptionapparatus and tools disclosed herein may be made from materials orinclude materials that are visible under x-ray, fluoroscopy or any othersuitable imaging system. Such apparatus and tools may also be made ofdisposable materials, which are configured for single use applications.Alternatively, such apparatus and tools may be configured for multipleor repeat use. The apparatus and tools may be manually operated oroperated by an automated apparatus.

Furthermore, the apparatus and tools disclosed herein may be used incombination with each other or may be used by themselves, depending onthe procedure and the desired outcome. For example, as will be discussedin more detail below, one of the devices disclosed herein is a barriermember that is inserted into the intervertebral disc space to isolate aworking region within the disc space. The barrier member may, forinstance, at least partial isolate or enclose intervertebral disc tissuewhich is selected for disruption and separate such tissue from othertissue adjacent to the treatment area. The present disclosure alsodiscloses various tissue disruption tools that may be inserted into theworking region defined by the barrier member to disrupt tissue containedwithin the working region. The barrier member may be used with any ofthe tissue disruption tools disclosed herein or any other suitabledisruption tools, such as traditional curettes, rongeurs and rasps.Similarly, the disruption tools disclosed herein may be used incombination with any of the barrier members disclosed herein or may beused to disrupt tissue in procedures that do not use a barrier member.

FIG. 1 illustrates a section of a healthy vertebral (spinal) column,generally designated as 20. Vertebral column 20 includes vertebrae 22and intervertebral discs 24 separating adjacent vertebrae 22.Intervertebral discs 24 connect the adjacent vertebra 22 together,providing a joint between the vertebrae that allows movement and flexingof the vertebral column 20. Intervertebral discs 24 also provide acushion between the adjacent vertebrae 22.

FIG. 2 illustrates a perspective view of one of the intervertebral discs24 and an associated inferior vertebra 22. The intervertebral disc 24includes a nucleus pulposus 26 surrounded by an annulus fibrosus 28. Thenucleus pulposus 26 is a gelatinous-like material that providescushioning between adjacent vertebrae. The annulus fibrosus 28 is madeup of tougher fiberous material that contains the nucleus pulposus 26 inthe nuclear space.

FIGS. 2A-3 illustrate one embodiment of a tissue disruption apparatus 30that may be inserted through an access cannula 32 in a minimallyinvasive procedure to perform a discectomy or prepare intervertebraldisc 24 for insertion of an implant. In the illustrated embodiment,distal end portion 34 of access cannula 32 is inserted through theannulus fibrosus 28 of disc 24, using a percutaneous posterior approach,to access nucleus pulpous 26. Depending on the procedure, an anteriorapproach may be employed. A proximal end portion 36 of access cannula 32may remain outside of the patient. Access cannula 32 includes a proximalend opening 38 and a distal end opening 40 and a lumen (not shown) incommunication with openings 38, 40.

The tissue disruption apparatus 30, optionally, includes a firstdelivery cannula 42 having a proximal end portion 44 defining a proximalend opening 46 and a distal end portion 48 defining a distal end opening50. A lumen (not shown) extends and is in communication with proximaland distal end openings 46, 50. As shown in FIGS. 2A and 2B, anelongated member 52 is advanceable through delivery cannula 42 and intointervertebral disc 24. Elongated member 52 may be an elongated barriermember that includes a proximal end portion 54 and a distal end portion56 (FIGS. 2B and 3). Proximal end portion 54 may, optionally, include aknob or handle 58 that may be used to advance and retract the elongatedmember 52 into and out of the intervertebral disc 26, or advance andretracted elongated member 52 through delivery cannula 42, when one ispresent.

At least the distal end portion 56 of the elongated member 52 includes afirst configuration for insertion/deployment into intervertebral disc24. In disc 24, distal end portion 56 of elongated member 56 has asecond configuration which forms a barrier 60 that at least partiallydefines a working region 62 within disc 24. Barrier 60 defines at leasta portion of a perimeter or boundary of working region 62 for tissuedisruption. Depending on the procedure, the tissue to be disrupted maybe substantially the entire nucleus pulpous 26, a portion of the nucleuspulpous 26 and/or a portion of the annulus fibrous 28. In oneembodiment, barrier 60 surrounds substantially the entire nucleuspulpous. Barrier 60 also separates the tissue to be disrupted from othersurrounding tissue. For example, barrier 60 may isolated disc tissuewhich is selected for disruption from other surrounding tissue.

In the illustrated embodiment, at least the distal end portion 56 ofelongated member 52 includes a first substantially linear configurationfor advancement through the lumen of delivery cannula 42 for deploymentinto disc 24. As distal end portion 56 of elongated member 52 is advanceinto the disc space, it transverses through the disc space and curvesinto a second, less linear configuration that at least partiallysurrounds and isolates tissue selected for disruption. Distal endportion may extend to form a barrier that at least partially surroundsipsilateral and/or contralateral disc tissue. In one embodiment, thedistal end portion 56 of elongated member 52 extends contralaterally soas to define a working region that includes at least in part a sectionof the contralateral area.

In the illustrated embodiment, distal end portion 56 of elongated member52 changes from a first substantially linear configuration into a secondgenerally arcuate configuration. For example, the generally arcuateshape may be a generally circular shape (e.g., right circular shaped,oval, ellipse, etc.). The second configuration of the distal end portion56 of elongated member 52 may also be other regular and irregulargeometric shapes depending on the desired application. Additionally, thesecond configuration may be any portion of a geometric shape. Forexample, the second generally arcuate configuration may be a quarter,half or three-quarters of a circular shape. In one embodiment, thesecond generally arcuate configuration may be a circular shape thatextends almost a full circle (almost 360 degrees), but leaves an openingor open region 64 for ingress and egress of disruption tools. In anotherembodiment, the distal end portion of 56 of the elongated member 52 mayextend in a circular shape and come into contact with one or more of theaccess cannula 32 or tool delivery cannula 68 so as to fully enclose theworking region. In other embodiments, the distal end portion 56 of theelongated member 52 in the second configuration may extend between about270 degrees and 355 degrees so as to leave an open region to access theworking region. In one embodiment, the distal end portion extendsbetween about 345 degrees and 355 degrees.

Referring to FIGS. 4A and 4B, the elongated member may be made of aone-piece construct or multiple-piece construct. In the two-piececonstruct shown in FIG. 4A, the elongated member 52 a includes a shaft53 a wherein the distal end portion 56 a of the elongated member 52 a isattached to the shaft 53 a by a fastener 66, such as a screw, rivet orany other suitable fastener. In the one-piece construct shown in FIG.4B, the elongated member 52 is a one-piece strip of material, such as aribbon of material. In either embodiment, at least the distal endportion 56, 56 a of the elongated member 52, 52 a may be made of a shapememory material, such as a shape memory metal or polymer. One such shapememory material is Nitinol. When the distal end portion 56, 56 a of theelongated member 52, 52 a is made from a shape memory material, thedistal end portion 56, 56 a may have a predetermined or preset initialshape, such as the illustrated generally circular or ring shape. Thedistal end portion 56, 56 a may be constrained into a substantiallystraight configuration, by for example, the inner surface of thedelivery cannula 42. As the distal end portion 56, 56 a of the elongatedmember 52, 52 a is advanced out of the distal opening 50 of cannula 42,it is freed from constraint, which allows the distal end portion 56, 56a to return to its initial predetermined shape, thereby forming abarrier in situ that defines a working region 62.

Referring back to FIGS. 2A-3, tissue disruption apparatus 30 may,optionally, include a second delivery cannula 68 for deploying adisruption tool 78. Second delivery cannula 68 includes a proximal endportion 70 having a proximal end opening 72 and a distal end portion 74having a distal end opening 76. A lumen (not shown) extends through thesecond delivery cannula 68 and is in communication with the proximal anddistal end openings 72 and 76.

Tissue disruption tool 78 may comprise and elongated member 80 thatincludes a proximal end portion 82 and a distal end portion 84 (FIGS. 2Band 3). The elongated member 80 may be made of metal or polymericmaterial. The proximal end portion 82 may, optionally, include a knob orhandle 86 that may be used to advance and retract the tissue disruptiontool 78. Referring to FIGS. 2B and 3, a tissue disruptor 88 isassociated with the distal end portion 84 of the tissue disruption tool78. The tissue disruptor 88 may be configured to cut, scrape, brush,puncture, tear, grasp, extract, and/or remove tissue. Tissue disruptor88 may be a tissue cutter, scraper, brush, grasper, jaws, curette, raspor the like. Tissue disruptor 88 may be one-piece with elongated member80 or may be attached to elongated member 80. In the embodimentillustrated in FIGS. 2B, 3 and 6, tissue disruptor 88 is a brush-likemember that includes a plurality of bristles or tines 90. The tissuedisruption tool may include any suitable tissue disruptor depending onthe desired application. For example, the tissue disruptor 92 shown inFIG. 5 includes a plurality of geometrically shaped members 94 thatinclude sharp edges, blades and points 96. In the illustratedembodiment, the geometrically shaped members 94 are generallyrectangular and/or triangular configurations that include sharp edges,blades and points 96 for cutting tissue. As also shown in FIG. 5, thedistal tip 98 of the illustrated tissue disruption tool and any of theother disruption tools disclosed herein may be pointed or beveled orotherwise configured for piercing through tissue. In FIG. 7, the tissuedisruptor 104 may include bristles or tines 106 that extend in randomdirections from the disruption tool. Bristles and tines 88 and 106 maybe employed to scrape, brush and/or tear tissue and/or also may beemployed to capture or grasp tissue to be removed from the disc.

Turning back to FIGS. 2B and 3, distal end portion 84 of the disruptiontool 78 may be advanced out of the distal opening 76 of second deliverycannula 68, through the open region 64 of barrier 60 and into theworking region 62 defined by barrier 60. As the distal end portion 84 oftissue disruption tool 78 is advanced into working region 62, it mayslide or extend along barrier 60, which guides the distal end portion 84of disruption tool 78 along the perimeter of working region 62. In theillustrated embodiment, distal end portion 84 slides along barrier 60and the barrier serves as a track that guides distal end portion 84 in acurved path. Furthermore, the tissue disruptor 88 is orientated or facestowards the center of the working region 62.

The tissue disruption tool 78 may be made from a metal or polymericmaterial that is sufficiently rigid to be advanced through the discmaterial, but sufficiently flexible to follow along the barrier. Inother embodiments, tissue disruption tool 78 may be made from a shapememory material that has a pre-determined curve that may or may notfollow along the barrier 60. For example, if the tissue to be disruptedis generally located in the center of working region 62 or moreipsilateral, the curvature of the distal on portion 84 of the disruptiontool 78 being made from a shape memory material may be smaller than thatof the barrier 60 so that the distal end portion 84 can reach suchtissue.

As distal end portion 84 of disruption tool 78 is moved through theworking region 62, the tissue disruptor 88 contacts and disrupts tissue.The disruption tool 78 transverses through the working region 62 in anysuitable manner to disrupt tissue. For example, the disruption tool 78may be moved back and forth within the working region 62 to disrupttissue. The disruption tool also may be rotated or angle within theworking region 62. While disruption tool 78 is within the workingregion, barrier 60 contains tissue disruptor 88 within the workingregion 62 and protects adjacent tissue outside of working region 62 frominadvertently being disrupted. This is helpful during minimally invasiveprocedures wherein the surgeon's vision is limited, which increases riskand injury from inadvertent disruption of surrounding tissue. In suchminimally invasive procedures, barrier 60 protects surrounding tissueand reduces the risk that such surrounding tissue will be damaged.

After disruption tool 78 has disrupted a desired amount of tissue inworking region 62, it is retracted from disc 24 and one or moresubsequent tools may, optionally, be inserted into the disc space. Thesubsequent tools may be the same or similar type of tool or may be adifferent type of tool. Accordingly, multiple types of disruption toolsin any desired order may be inserted and removed from working region 62.For example, cutting tools may first be inserted to cut tissue.Extraction tools may then be inserted to remove tissue. Puncture andscraping tool may be inserted to puncture and/or scrape the surfaces ofthe endplates within the perimeter of working region 62.

Disruption tool 78 may be retracted from the disc 24 by retracting thedistal end portion 84 back into delivery cannula 68 and then removingdelivery cannula 68 from access cannula 32, or disruption tool 78 may beretracted through delivery cannula 68, wherein delivery cannula 68remains in place for insertion of subsequent disruption tools.

FIGS. 8A and 8B illustrate another embodiment of a tissue disruptiontool 78 a and associated delivery cannula 68 a shown positioned withinaccess cannula 32 a. In this embodiment, delivery cannula 68 a includesa distal end extension 69 a that extends beyond the distal end opening76 a of the delivery cannula 68 a. Prior to being deployed and whiletissue disruption tool 78 a and delivery cannula 68 a are being insertedthrough the access cannula 32 a, distal end extension 69 a may protecttissue disruptor 88 a. Furthermore, when tissue disruption tool 78 a ismade from a shape memory material that has a preset curvedconfiguration, distal end extension 69 a may maintain distal end portion84 a of the tool is a substantially straight configuration duringinsertion through the access cannula 32 a. Referring to FIG. 8B, whenthe distal end portion 84 a of tool 78 a is deployed, it resumes itspredefined configuration. Tissue disruption tool 78 a may also include ahandle 86 a for advancing and retracting the disruption tool into andout of delivery cannula 68 a.

As shown in FIG. 9, tissue disruption tool 78 b may be of a two-piececonstruct that includes a shaft 79 b wherein the distal end portion 84 bof the tissue disruption tool 78 b, carrying a tissue disruptor 88 b, isattached to shaft 79 b. Tissue disruption tool 78 b may also include ahandle 86 b for manipulating the disruption tool. In this embodiment,shaft 79 b and distal end portion 84 b may be made of the same ordifferent materials. For example, distal end portion 84 b may be madefrom a shape memory material while shaft 79 b may be made from adifferent, non-shape memory material.

FIGS. 10A-15 show a tissue disruption apparatus 108 that includes ahousing 110 and at least one delivery cannula 112 extending therefrom.In the illustrated embodiment, the delivery cannula 112 includes a firstdelivery lumen 114 (FIGS. 10B and 11) and a second delivery lumen 116.In other embodiments, the at least one delivery cannula may be twoseparate cannulas each having its own lumen. Referring to FIGS. 10A and10B, delivery cannula 112 includes a proximal end portion 118 that isconnected to and extends into the housing 110. Delivery cannula 112 alsoincludes a distal end portion 120 that is configured for insertion intoa disc space through an access cannula, similar to that shown in FIG.2A, or without an access cannula.

In the illustrated embodiment, an elongated member 122 that isconfigured to form a barrier within the disc space, similar to elongatedmember 52 discussed above, is located within first lumen 114, as shownin FIG. 10B. Elongated member 122 may come pre-assembled in lumen 114 oftissue disruption apparatus 108. Elongated member 122 includes aproximal end portion 124 (FIG. 10B) and a distal end portion 126.Proximal end portion 124 is operatively connected to any suitabledeployment/retraction mechanism or actuator 128 for advancing andretracting elongated member 122 through lumen 114.

In the illustrated embodiment, deployment/retraction mechanism 128includes a rotatable knob 130 having a threaded post 132 extendingtherefrom and which rotates therewith. A carriage 134 is located on post132 and includes internal threads that complement the threads of post132 such that when the post is rotated in one direction, carriage 134travels distally along post 132, and when the post is rotated in theother direction, carriage 134 travels proximally along post 132.Proximal end portion 124 of elongated member 122 is attached to carriage134 such that as the carriage travels distally along post 132, elongatedmember 122 advances distally through lumen 114 and out distal opening115. Conversely, as carriage 134 travels proximally along post 132,elongated member 122 is retracted proximally within lumen 114.

Referring to FIGS. 10B and 11, in use, distal end portion 120 ofdeployment cannula 112 may be inserted into the disc space during aminimally invasive procedure. When inserted, distal end portion 126 ofelongated member 122 is located within lumen 114 in a firstconfiguration, as shown in FIGS. 10B and 11. In these figures, distalend portion 126 of elongated member 122 is in a generally linearconfiguration. After distal end portion 120 of deployment cannula 112 isinserted and placed in the desired position, the user rotates knob 130to advance distal end portion 126 of elongated member 122 out of adistal opening 115 that is in communication with lumen 114. As distalend portion 126 exits out of distal opening 115, it changes into asecond configuration, such as the illustrated generally circularconfiguration, shown in FIG. 12, to form a barrier 136 that defines atleast a portion of a perimeter or boundary of a working region 138. Thesecond configuration of elongated member 122 may be similar to and havethe same or similar characteristics as the second configurationdescribed above with respect to elongated member 52. As will bediscussed in more detail below, barrier 136 may have an open region 140for the insertion of disruption tools.

Referring to FIGS. 13-15, the tissue disruption apparatus 108 mayinclude a deployment aid or enhancer that may assist in the deploymentof distal end portion 126 of elongated member 122. In some patients, theendplates and/or discs may be highly calcified, in which case, distalend portion 126 of the elongated member 122 may encounter resistance asit is advanced through the disc space. Such resistance may impedeinsertion of distal end portion 126 into the disc space and also mayimpede the ability of distal end portion 126 to form the desired orpre-set shape of the barrier 136. As illustrated in FIGS. 13-15, thedeployment enhance may include a pull wire, such as tether 142, that maybe pulled or otherwise tensioned to assist in advancing distal endportion 126 of the elongated member 122 through the disc space and/orforming distal end portion 126 into a desired shape barrier 136. InFIGS. 13-15, tether 142 is attached to distal end portion 126 of theelongated member 122. Tether 142 passes through an opening 144 in distalend portion 120 of delivery cannula 112 so that when it is pulled orotherwise tensioned, it pulls or guides the distal tip 146 of theelongated member 122 toward distal end portion 120 of delivery cannula112 to assist traversing distal end portion 126 of elongated member 122through the disc space and/or to assist forming it into the desiredshape. In the illustrated embodiment, tether 142 assists in forming thedistal end portion of the elongated member into a circularconfiguration.

In FIG. 13, tether 142 may extend through a first opening 144 and intolumen 16 of delivery cannula 112 and then extend out through a secondopening 148. Tether 142 extends proximally outside of the tissuedisruption apparatus 108 and a handle 150 is associated with theproximal end portion 152 of tether 142. When in use, tether 142 mayextend from the disc space through the access channel with handle 150located outside of the proximal end opening of the access channel sothat the user may grasp and pull the handle 150 during use.

In FIG. 14, tether 142 extends through opening 144 in delivery cannula112, through lumen 116 and out of the proximal opening of housing 110.In FIG. 15, tether 142 may extend through opening 144 in deliverycannula 112 and through lumen 116. The proximal end portion of tether112 may be attached to an actuator 154 that is actuated by the user toplace tension on the tether. In the illustrated embodiment, the actuator154 is a level pivotally attached to the housing 110 wherein the leveleris moved to place tension on the tether.

As discussed above, second lumen 116 is configured to receive workingtools therethrough. Referring to FIG. 10C, housing 110 may include anopening 156 for receiving a tool therethrough and into second lumen 116.In the illustrated embodiment, knob 130 may also include openings 158therethrough so that the tools may access opening 156.

FIG. 16 illustrates one exemplary embodiment of an obturator 160 thatmay be inserted into and through lumen 116 (FIG. 10B). Obturator 160 hasan elongated shaft 162 having a proximal end portion 164 and a distalend portion 166. A hub 168 for handing obturator 160 and releasablyconnecting obturator 160 to housing 110 of the tissue disruptionapparatus 108. Referring to FIGS. 17A and 17B, obturator 160 may beinserted through opening 158 in knob 130 and opening 156 in housing 110(FIG. 10C) to insert shaft 162 into and through lumen 116. As shown inFIG. 17A, the distal tip 170 of obturator 160 is pointed and/or sharpand extends out of opening 117 of lumen 116 and distally of the distalend portion 120 of cannula 112. Obturator 160 may be employed to assistin inserting cannula 112 into and through tissue in that distal tip 170of obturator 160 may be used to pierce tissue as cannula 112 is insertedinto and through the tissue. For example, cannula 112, with obturator160 located therein, may be inserted percutaneously through the skin andsoft tissue without the need for a previously inserted access cannula.

Additionally, hub 168 may include a releasable locking mechanism thatmates with knob 130 to releasably lock obturator 160 to tissuedisruption apparatus 108. Referring to FIG. 17B, the locking mechanismmay include a depressible lever 172 in which the distal end 174 thereofis pivotally connected to hub 168. The proximal end 176 is biased upwardto a locked position by a biasing member 178, such as the illustratedspring. Lever 172 includes a surface 180 which contacts a surface 182 ofknob 130 in an opposed relationship to lock obturator 160 into positionwithin tissue disruption apparatus 108. Locking obturator 160 to knob130 assists in maintaining obturator 160 in position as cannula 112 isinserted and pushed through tissue. The proximal end surface 184 of hub160 also may be flat or otherwise conducive to striking with a hammer ormallet to aid in inserting cannula 112 into and through tissue. Oncecannula 112 is the desired position, proximal end 176 of lever 172 maybe depressed to disengage surface 180 from knob 130. Obturator 160 maythen be removed from tissue disruption apparatus 108 and other tools maybe inserted into and through lumen 116.

FIGS. 18-24 show one embodiment of a tissue disruption tool 186 that maybe used with tissue disruption apparatus 108. Turning to FIGS. 18 and21, tissue disruption tool 186 includes a shaft 188 having a proximalportion 190 and a distal end portion 192. Shaft 188 also includes alumen 194 extending therethrough. An elongated member 196 extendsthrough lumen 194. Elongated member 196 has a proximal end portion 198,an intermediate portion and a distal end portion 202. Referring to FIGS.18 and 22, proximal end portion 198 of elongated member 196 extendsproximally out of proximal end portion 190 of shaft 188 and distal endportion 202 of elongated member 196 extends distally out of distal endportion 192 of shaft 188. A handle 204 is associated with proximal endportion 198 of elongated member 196. Handle 204 may be grasped by a userto move elongated member 196 distally and proximally with lumen 194 ofshaft 188. Furthermore, elongated member 196 may include a stop (notshown) that limits the movement of the elongated member 196 within thelumen 194 of shaft 188. Such a stop may include a post (not shown) whichextends from elongated member 190 into channel 195 of shaft 188. Thestop may abut the distal end 197 (FIGS. 19 and 20) of channel 195 tolimit the distal advancement of the elongated member 196. Channel 195may also be used to access and assemble elongated member 196 when it isof a multi-piece construct. For example, channel 195 may be accessed toattach pieces of the elongated member 196 to form the same.

Referring to FIGS. 19 and 20, a tissue disruptor 206 is associatedwithin with distal end portion 202 of elongated member 196. Tissuedisruptor 206 may be any tissue disruptor disclosed herein or any othersuitable tissue disruptor or end effector. In the illustratedembodiment, tissue disruptor 206 includes three hollow members 208having generally square profiles. The hollow members include edges 210for cutting tissue. Distal end portion 202 of elongated member 196 maybe made of a material that has sufficient flexibility to bend or curvewhen inserted along the barrier member, or may be made of a shape memorymaterial that has a preset shape. Comparing FIGS. 19 and 20, handle 204may be used to move elongated member 196 between an initial retractedposition shown in FIG. 19 and an extended or deployed position shown inFIG. 20.

Tissue disruption tool 186 may include a protector 214 which protectstissue disruptor 206 prior to insertion into tissue disruption apparatus108 (FIG. 10A). Referring to FIGS. 22-24, protector 214 may be a sleevehaving a lumen for receiving the shaft 188 therethrough. In thesefigures, protector 214 is shown in an initial position extending overand covering tissue disruptor 206. Referring to FIGS. 18 and 22,protector 214 and shaft may be relatively moveable to one another suchthat protector 214 may be moved on shaft 188 from the initial distalposition to a proximal position. Referring to FIGS. 23 and 24, protector214 may include a tab 216 that has a projection 218 that projects into aslot 220 of the distal end portion 192 of shaft 188 to releasably lockprotector 214 in the initial position. As will be described in moredetail later, when tissue disruption tool 186 is inserted into tissuedisruption apparatus 108, protector 214 will be released and shaft 188will pass through it to move protector 214 into a more proximal positionshown in FIG. 18.

FIGS. 25 and 26 illustrate another embodiment of a tissue disruptiontool 222, which includes substantially the same features and functionsin substantially the same manner as tissue disruption tool 186. Tissuedisruption tool 222 includes a disruptor 224 associated with distal endportion 198 of elongated member 196. Disruptor 224 includes a singlehollow cutting element 230 that has a generally square profile andcutting edges 230.

Referring to FIGS. 27A-27C, illustrate the use of tool 222 withapparatus 108. Cannula 112 of tissue disruption apparatus 108 isinserted into the disc space and distal end portion 126 of elongatedmember 122 is deployed to form a barrier 136. As discussed above, thedistal end portion 126 of elongated member 122 may extend almost a full360 degrees. In one embodiment, the distal end portion 126 comes intocontact with the distal end portion 192 of the shaft and/or the distalend portion 120 of the delivery cannula 112 to fully enclose the tissueto be disrupted. After the barrier 136 has been deployed, a tissuedisruption tool, such as any of the tissue disruption tools disclosedherein or any other suitable tissue disruption tool, is inserted intothe lumen 116 of tissue disruption apparatus 108 (FIG. 10B). In theillustrated embodiment, tissue disruption tool 222 is shown insertedinto tissue disruption apparatus 108. Tissue disruption tool 222 may beinserted through opening 158 in knob 130 and distal opening 156 ofhousing 110 (FIG. 10C). Referring to FIG. 27B, when tissue disruptiontool 222 is inserted into opening 156 of housing 110, protector 214enters and is maintained in a cavity 232 defined by housing 110. Asshaft 188 is advanced through housing 110, protector 214 enters andremains in cavity 232 (FIG. 10B). As shaft 188 is further advancedthrough housing 110, the angled surface of projection 218 of protector214 contacts angled surface 219 of distal end portion 192 of shaft 188(FIG. 24) to release protector 214 and allow shaft 188 to pass throughprotector 214 and into the lumen 116 of cannula 112.

As shown in FIG. 27C, when tissue disruption tool 222 is fully insertedinto lumen 116, the distal end 192 of shaft 188 of tissue disruptiontool 222 aligns with opening 117 of cannula 112 and distal end portion202 and associated tissue disruptor 224 partially enter working region138 through opening 140 of the barrier 136. Referring to FIGS. 28A and28 B, the user uses handle 204 (FIG. 25) to advance distal end portion202 and associated disruptor 224 into working region 138. In theillustrated embodiment, distal end portion 202 has sufficientflexibility to curve along barrier 136 and sufficient rigidity totraverse and disrupt tissue within barrier 136. After elongated member196 has been advanced, the user uses handle 204 to retract distal endportion 202 back into the lumen of the shaft 188. Tissue disruption tool222 may be removed from tissue disruption apparatus 108 and a similartype or different type of tissue disruption tool may be inserted and theprocess may be repeated. After the selected tissue has been disrupted,tissue disruption apparatus 108 may be removed from the patient.

FIGS. 29-40 illustrate various tissue disruption tools that may be usedin combination with any of the barriers disclosed herein. Such tissuedisruption tools may also be used in procedures that do not include theuse of a barrier. Additionally, the disruption tools may be used todisrupt intervertebral disc and/or endplate tissue.

Referring to FIGS. 29-31, tissue disruption tool 240 includes a cannula242 which defines a lumen 244. Cannula 242 includes a proximal endopening 246 and a distal end opening 248. A shaft or elongated member250 is located within the lumen 244. The proximal end 252 of shaft 250includes a threaded portion 254 which mates with threads in proximal endopening 246 of cannula 242. A knob 257 may be associated with threadedportion 254 and used to rotate threaded portion 254 within opening 246.Threaded portion 254 of shaft 250 may be rotatable connected to anintermediate portion 255 of shaft 250 so that threaded portion 254 maybe rotated relative to the remaining portions of shaft 250.

At the distal end portion 256 of shaft 250 is a tissue disruptor 258. Inthe illustrated embodiment, tissue disruptor 258 is a generally opencubicle member having an opening 260 defined by sharp edges 262. Tissuedisruptor 258 includes a cavity 263 that may act as a scoop for scoopingtissue. The distal end 256 of shaft 250 and associated tissue disruptor258 may be advanced out of distal end opening 248 by rotating knob 257.Rotating knob 257 in one direction causes shaft 250 to advance distallyand rotating knob 257 in the other direction causes shaft 250 to retractproximally. In other embodiments, the disruptor may be advanced andretracted by other mechanism such as a ratcheting or rack and pinionsystem or a handle and worm gear. Distal end 249 of cannula 242,optionally, may be enlarged to accommodate the profile of tissuedisruptor 258.

Distal end portion 256 of shaft 250 may be made of a shape memorymaterial that has a pre-set curved shape when unrestrained or may bemade of a flexible material that curves along a barrier when advancedtherealong. Additionally, the distal end portion 256 of elongated member250 may have a radius of curvature between about 5 mm and about 50 mm.In one embodiment, the radius of curvature is sufficient so that thedisruptor 258 may reach contralateral material. For example, the radiusof curvature may be about 25 mm. The length of the distal end portion256 may be between about 4 inches and about 12 inches.

Disruptor 258 may be inserted into the disc space to clear loose orpartially detached nucleus tissue from the disc space before an implantis inserted into the space. Additionally, sharp edges 262 may contactand separate tissue from the inferior and superior endplates. Theprofile of disruptor and the curvature of distal end portion 256 ofelongated member 250 may be selected to match or mimic the insertion ofan implant, so that disruption tool 240 may be used to test that theremoval of tissue (e.g., discectomy) is adequate for insertion or theimplant.

FIGS. 32-34, show exemplary embodiments of tissue disruptors that may beassociated with any of the tissue disruption tools disclosed herein.Referring to FIG. 32, tissue disruptor 264 has a generally round hollowprofile that is generally cylindrically shaped. Tissue disruptor 264includes a round sharpened edge 266 configured to disrupt tissue. Thedisc material may pass through the opening in the disruptor 264 as it isadvanced through the disc. While the illustrated profile is round, thedisruptor may have any hollow profile having wherein one or both endsare open. FIG. 33 illustrates a tissue disruptor 268 that has agenerally triangular profile having an open end defined by sharpenededges 270.

FIG. 34 illustrates a tissue disruptor 272 which has a generallyspade-like shape including an edge for cutting 273 and piercing tissue.Edge 273 may be particularly configured for disrupting tissue of theendplates and the edge may provide a down bite (surfaces configured toscrape or otherwise disrupt tissue when the disruptor is advanced) or anup bite (surfaces configured to scrape or otherwise disrupt tissue whenthe disruptor is retracted). Additionally, one side of the disruptor 272or the other may be particularly suited for scraping the superior orinferior endplate.

FIGS. 35-40 illustrate additional tissue disruption tools that may beparticularly well suited for disrupting endplate tissue, but may also beemployed to disrupt disc tissue. The tools illustrated in these figuresmay include a delivery cannula 275 and a shaft 277 having a tissuedisruptor associated with a distal end portion 278 of shaft 277. Similarto the above discussed embodiments, the distal end portion 278 of shaft277 may have a radius of curvature and/or length of distal end portion256 of shaft 250. FIG. 35 shows a tissue disruptor 274 that includes agenerally ogive or oblong shape. Disruptor 274 may be formed from aplurality of layers 276 stacked on both sides of the distal end portion278 of shaft 277 and attached by fasteners 282. Each of the layers 276may include edges that are sharp or otherwise configured to cut, scrapeor puncture endplate tissue. FIG. 36 shows a tissue disruptor 284 thathas a generally rectangular cuboid shape. Tissue disruptor 284 mayinclude upper and/or lower cavities 286 and edges 288 that may be sharpor otherwise configured to cut, scrape or puncture endplate tissue.FIGS. 37 and 38 show a tissue disruptor 290 that is generally ogive oroblong shaped and includes edges 283 for scraping or cutting endplatetissue. In FIG. 37, tissue disruptor 290 is angled or titled upwardrelative to distal end portion 278 of shaft 277. The upward angle may beparticularly suited for disrupting tissue of a superior endplate. InFIG. 38, tissue disruptor 290 is angled or titled downward relative todistal end portion 278 of shaft 277. This downward angle may beparticularly well suited for disrupting tissue of an inferior endplate.FIG. 39 shows a tissue disruptor 296 that has a generally rectangularcuboid or cubic shape. The upper and/or lower surfaces 298 may include atexture configured for disrupting endplate tissue. For example, thesurfaces may include spikes or serrations. FIG. 40 shows a looped tissuedisruptor 300 that may include upper edge 302 and lower edge 303 thatmay be sharp or otherwise configured to contact and, disrupt endplatetissue. In any of the above discussed disruptors, the surface may beparticularly configured to provide a down bite or an up bite.

FIGS. 41-45 show tissue disruptor 274 being used with tissue disruptionapparatus 108 and deployed within working region 138 defined by barrier136. It will be understood that any of the tissue disruptors shown inFIGS. 35-40 may be used with tissue disruption apparatus 108 in asimilar manner. In FIGS. 42 and 43, cannula 112 of the tissue disruptionapparatus 108 is inserted into the disc space and between superior andinferior end plates 304, 306 and elongated member has been deployed toform barrier 136. FIG. 42 shows tissue disruptor 274 being rotated orangled upward to disrupt tissue of superior endplate 304 within theworking region defined by barrier 136. FIG. 43 shows tissue disruptor274 being rotated or angled downward to disrupt tissue of inferiorendplate 306 within the working region. In both instances tissuedisruptor 274 may manipulated to contact and scrape endplate tissue byback and forth and rotational movement.

As discussed above, distal end portions of the tissue disruption toolsmay have configurations that are particularly conducive for reaching amore contralateral or ipsilateral region. Turning to FIGS. 44 and 45,FIG. 44 shows an embodiment wherein distal end portion 278 of shaft 277has a tighter radius of curvature. FIG. 45 shows an embodiment whereindistal end portion 278 of shaft 277 has a larger radius of curvature.

FIGS. 46-52 illustrate another embodiment of a tissue disruption tool310 that may be used with the tissue disruption apparatus disclosedherein or may be used as a tool on its own. Furthermore, tissuedisruption tool 310 may be particularly well suited for scrapingendplate tissue. Tissue disruption tool 310 may include a firstelongated shaft 312 having a proximal end portion 314 and a distal endportion 316 and a second elongated shaft 318 having a proximal endportion 320 and a distal end portion 322. The second shaft 318 may bepositioned in an axially extending channel 324 of the first shaft 312,as shown in FIG. 50. A first jaw 326 is attached or extends from thedistal end portion 316 of the first shaft 312. A second jaw 328 includesa portion 327 that extends through a slot 329 (FIG. 52) in first shaft312 so that it can be pivotally attached to the distal end portion 322of the second shaft 318 at a first joint 330, such as a joint that usesa pivot pin. The second jaw 328 is also pivotally attached to the firstjaw 326 or the first shaft 312 at a second joint 332, such as a pivotpin joint, that is at a location distal of the first joint 330 when thejaws are in a closed position.

The first and second shafts 312, 318 are moveable linearly relative toone another and when the second shaft 318 is moved distally relative tothe first shaft 312, the second jaw 328 pivots relative to the secondshaft 318 at joint 330 and pivots relative to the first shaft 312 or jaw326 at joint 332, thereby moving the second jaw 328 away from the firstjaw 326 and placing the jaws in an open position. In the fully openedposition, the rear wall 333 of jaw 328 may contact the first shaft at335. Such contact acts as a stop to prevent movement beyond a setmaximum open position. In the illustrated embodiment, the maximum openposition is 90 degrees, which could be greater or smaller depending onthe procedure. The stop assists in preventing the jaw from damagingother tissue. When the second shaft 318 is moved proximally relative tofirst shaft 312, the second jaw 328 moves toward the first jaw 326,thereby placing the jaws in a closed position.

In the illustrated embodiment, the second jaw 328 is oversized andbigger than the first jaw 326. As shown in FIG. 46, the oversized secondjaw 328 may be helpful in reaching contralateral tissue. As shown inFIGS. 51 and 52, moveable jaw 328 may have sharp edges 336 for that maycontact and scrape endplate tissue. Sharp edges 336 may also be used tocut tissue when the jaws perform a scissoring action. The edges 336 maybe beveled, scalloped or serrated. Second jaw 328 also may have aconcaved inner surface 334 for scoping tissue. First 326 may alsoinclude sharp edges 337 that may be used to scrape endplate tissue.Furthermore, jaw 326 and jaw 328 may include respective blunt ends 341and 343 which assist in preventing damage to surrounding tissue, such asannulus tissue when the tool is inserted and manipulated duringscraping. Turning back to FIG. 46, tissue disruption tool may beassociated with a housing or handle 338 that includes an actuationmember 340, such a rotatable knob, that is actuated to move the secondshaft 318 relative to the first shaft 312.

FIGS. 53-60 illustrate tissue disruption tools that include anarticulating tissue disruptor associated with the distal end of thetool. The tool includes a first shaft 342 having a distal end 344 andsecond shaft 346 having a distal end 348. The tool includes a disruptorpivotally attached to the first shaft 342 at a first joint 350 andpivotally attached to the second shaft 346 at a second joint 352. Theshafts 342 and 346 may be linearly moveable relative to one another tomove the disruptor from a first configuration relatively in-line withthe shafts 342 and 346 to a second configuration wherein the disruptorextends at an angle to the shafts 342 and 346.

Referring to FIGS. 53 and 54, tissue disruptor 354 has a generally ogiveshape that includes a pointed distal end portion 356 which may be suitedfor puncturing endplates. Additionally, the surfaces 358 on one or bothsides of disruptor 354 may be beveled or angled in toward a centeropening 360. The outer edges 362 of side surfaces 358 may be sharp orotherwise configured to cut and/or scrape tissue. For example, outeredges 362 may be configured to contact the superior and inferiorendplates of the vertebral body. Center opening 360 may collectdisrupted tissue for removal for the disc space when the tool isremoved. As discussed above, the tissue disruptor 354 is articulated bymoving the first and second shafts 342 and 346 relative to one another.For example, as shown in FIG. 54, the tissue disruptor 354 may have aninitial generally straight configuration that is generally in-line withshafts 342 and 346. This generally linear configuration may beparticularly suited for inserting the tissue disruption tool into thedisc space. When the second shaft 346 is moved proximal to the firstshaft 342, the tissue disruptor 354 pivots at the first and secondjoints 350, 352 to thereby result in the tissue disruptor to articulaterelative to the shafts. The disruptor may be moved back and forth in thestraight, in-line or angled configurations to disrupt tissue.

In FIGS. 55 and 56, tissue disruptor 364 has a generally ogive shape,wherein the upper and lower surfaces 366 are beveled or angles inwardtoward a center opening 368. The outer edges 370 of the upper and lowersurfaces 366 may be sharp or otherwise configured to cut and/or scrapetissue, such as endplate tissue.

In FIGS. 57 and 58, tissue disruptor 372 has a generally ogive shape,wherein the upper and lower surfaces 374 are beveled or angled outwardlyand meet at an edge 376 that may be sharp or otherwise configured to cutand/or scrape tissue, such as endplate tissue.

FIGS. 59 and 60 illustrate an embodiment wherein the tissue disruptiontool includes an actuator, such as handle 378, which may be used to movethe first and second shafts 342 and 346 relative to one another. Thehandle 378 includes a stationary grip 380 and a pivotal grip 382pivotally connected to the handle 378. The handle 378 also includes abiasing member 384 that biased the pivotal grip 382 away from thestationary grip 380. When the pivotal grip 382 is moved toward thestationary grip 380, the second shaft 346 moves distally relative to thefirst shaft 342 to articulate the tissue disruptor.

FIGS. 61 and 62 illustrate another embodiment of tissue disruption tool400 that includes an articulating tissue disruptor 402. Tissuedisruption tool 400 includes a shaft 404 that has a proximal end 406 anddistal end 408. The tool is shown inserted into a disc space through anaccess cannula 410. The disruptor 402 is pivotally attached to thedistal end portion 408 at joint 409. Disruptor 402 includes upper and/orlower sharp edges 403 that are configured to disrupt tissue. Such edges403 may be particularly suited to disrupt endplate tissue. Disruptor 402also may include a blunt end 405 that protects tissue as the tool isinserted and disrupts tissue. An actuator, such a handle 412, is locatedat the proximal end portion 406 of shaft 404. The handle 412 includes astationary grip 414 and a pivotal grip 416 pivotally connected to thehandle 412. When the pivotal grip 416 is moved toward the stationarygrip 414, the disruptor 402 moves from a first configuration generallyin-line with the shaft 404 to a second angled configuration relative toshaft 404. The actuator may be used to move disruptor 402 back and forthand/or disruptor 402 may be pushed back and forth by the shafts.

FIGS. 63-69 illustrate another embodiment of a tissue disruption tool420, which includes articulating jaws associated with the distal ends ofthe shafts of the tool. The jaws are moveable between a first, generallylinear configuration in which the jaws are generally in-line with theshafts of the tool to a second condition in which the jaws extend at anangle to the shafts. The jaws may be placed in the first, generallyin-line configuration to insert the jaws into the treatment site. In thetreatment site, the jaws may be moved to the second, angledconfiguration to reach tissue contralateral to the access site.

Turning to FIGS. 63-66, disruption tool 420 includes a first elongatedshaft 422 having a proximal end portion 424 and a distal end portion426. The tool 420 also includes a second elongated shaft 428 that has aproximal end portion 430 and a distal end portion 432. Referring toFIGS. 67A-67B, tool 420 includes a first jaw 434 pivotally attached tothe distal end 426 of the first shaft 422 at joint 436. The tool 420also included a second jaw 438 opposed to first jaw 434. The second jaw438 is pivotally attached to the distal end 440 of a link 442 at joint444. The proximal end 446 of the link 442 is pivotally attached to thedistal end 432 of the second shaft 428 at joint 448. The proximal end450 of second jaw 438 is pivotally attached to the first jaw at joint452. The first jaw includes a biasing member 454. In the illustratedembodiment, tool 420 includes a torsion spring that is centered aboutjoint 436 and resides in a cavity 456 between first jaw 434 and distalend portion 426 of shaft 422. The terminal ends 458 of the torsionspring contact the first jaw 434 and distal end portion 426 to bias thejaw to the angle configuration.

Turning back to FIGS. 63-66, tool 420 includes a actuator, such ashandle 460 which includes a stationary grip 462 connected to theproximal end portion 424 of the first shaft 422. The handle 460 alsoincludes a pivotal grip 464 which is pivotally attached to handle 460 atjoint 466 and pivotally attached to the proximal end portion 430 ofsecond shaft 428 at joint 468.

FIGS. 65 and 67A show jaws 434 and 438 in their initial configuration,biased to the angled configuration wherein the jaws 434 and 438 extendat an angle to shafts 422 and 428. Turning to FIGS. 66 and 67B, when thepivotal grip 464 is moved toward stationary grip 462, the second shaft428 moves distally relative first shaft 422, moving jaws 434 and 438into an in-line or generally straight configuration. This generallyin-line configuration may be the first configuration the jaws 434 and438 are placed into for insertion into a treatment site. The jaws 434and 438 being in-line with the shafts 422 and 428 make it easier toinsert the tool through an access cannula. Once the jaws are in thetreatment site, the pivotal grip 464 may be moved back into the positionshown in FIGS. 65 and 67A, thereby moving the second shaft 428proximally and placing the jaws back into an angled configuration.Turning to FIGS. 64 and 67C, the pivotal grip 464 may be moved furtheraway from stationary grip 462 to move shaft 428 further distallyrelative to shaft 422, thereby opening jaws 434 and 438. The jaws 434and 438 may then be place to grasp or cut tissue in a scissor action andmoved back into the closed position shown in FIGS. 65 and 67A. The jaws434 and 438 may then be placed back into the in-line configuration shownin FIGS. 66 and 67B to remove the jaws 434 and 438 and tissuetherebetween from the treatment site.

FIGS. 68 and 69 illustrate an embodiment wherein the tool includes aflat or leaf spring 470 attached to shaft 422 and jaw 434 to bias thejaws 434 and 438 to the angled configuration.

FIGS. 70-77 illustrate further embodiments of tissue disruption tools ofthe present disclosure. Referring to FIG. 70, tissue disruption tool 474may include an elongated member 476 that may be inserted into a discspace 24 through a cannula 478. Tool 474 may include a housing 479 thathas an actuator 480 associated therewith to advance and retract theelongated member 476 into our out of the distal end 482 of the cannula478. The actuator may be of a similar construct to that of tool 240 ofFIG. 29. At least the distal end portion 484 of the elongated member 476is made from a shape memory material that has an initial curvedconfiguration and is constrained by the cannula into a generallystraight configuration for deployment into the treatment site. As thedistal end portion 484 of the elongated member 476 exits the cannula 478it returns to it curved configuration. In the illustrated embodiment,the curved configuration is a generally circular configuration, such ascircle, oval or ellipse, that extends contralateral to reach tissuecontralateral to the access site. As will be described in more detailbelow, the elongated member may have edges or other features that areconducive for disrupting tissue.

Referring to FIG. 71, the distal end portion 484 of elongated member 476may have a ball 486 associated with the distal end portion 484. The balltip 486 may be atraumatic and reduce the risk of the distal end portionfrom piercing or cutting adjacent or surrounding tissue. The upperand/or lower edges 485 may be sharpened or otherwise configured todisrupt tissue when inserted into the disc space. The ball tip 486 mayfollow along the annulus without piercing or cutting it.

Referring to FIGS. 72 and 73, the distal end portion 484 of elongatedmember 476 may have a double diamond profile or cross-section in whichthe upper and lower edges 492, 494 are sharp or otherwise configured todisrupt tissue. The upper and lower edges may be particularly configuredto scrape endplate tissue. The upper and lower edges of distal portion484 may have other configurations as well, such as those showing inFIGS. 74-77. For example, referring to FIG. 74, the upper cutting edge488 may be smooth while the lower cutting edge may come to a pointededge 490. Referring to FIG. 75, both the upper cutting edge 492 and thelower cutting edge 494 may come to a pointed edge. Referring to FIG. 76,the upper edge 496 and the lower edge 498 may be rounded. Referring toFIG. 77, the upper edge 500 and lower edge 502 may be scalloped in onedirection or the other.

Referring back to FIGS. 72 and 73, when the distal end portion 482 ofelongated member 476 is inserted and extended through tissue, it maydisrupt the tissue into pieces 504. The elongate member 476 may includea lumen 506 for passage of another tissue disruption tool therethrough,such as tissue grasper 508. The tissue grasper 508 may include a distalend portion 510 that includes bristles or tines 512 for capturing orgrasping tissue 504 for removal from the treatment site.

FIG. 78 illustrates another embodiment of tissue disruption tool 514that includes a delivery cannula 516 and an elongated member 518 thatmay be inserted into the treatment site through the delivery cannula.The distal end portion 520 of the elongated member 518 is generallylooped shaped and may be about 10 mm in diameter. Also, the height ofthe loop may be such that the top surface and the bottom surface 526,528 of the loop contact the upper and lower endplates simultaneously.The looped distal end portion 520 may be passed through the cannula 516in a compact or linear configuration and upon exiting the cannula 516,the distal end portion 520 opens into the looped shape shown. The loopedshape distal end portion 520 may then be drawn back into the cannula 516for removal from the treatment site. The looped shaped distal endportion 520 may have any suitable profile for disrupting tissue.Referring to FIG. 79, for example, the profile or cross-section of thedistal end portion 520 may be generally square. Referring to FIG. 80,the profile or cross-section of the distal end portion 520 may betrapezoidal wherein the inner and outer edges 522 and 524 are beveled.As illustrated in FIGS. 81-83, the upper 526 and lower surfaces 528 maybe flat (FIG. 81), serrated (FIG. 82) or scalloped (FIG. 83). The distalend portion may also include any of the profiles shown in FIGS. 74-77.

FIG. 84 illustrated another embodiment of a tissue disruption tool 529that includes an elongated member 530 that is inserted through a cannula532. The elongated member includes a distal end portion 534 thatincludes at least two arms 536 and 538 that are closely adjacent to eachother for passage through the cannula and then extend away from eachother when they exit the cannula. FIG. 87 also shows an elongated member540 which includes a distal end portion 542 include two arms 544 and 546that may come together for passage through a cannula and then separateoutside of the cannula. In this embodiment one or both of the arms mayhave pointed distal ends 548. The arms of these embodiments may includeany of the profiles shown in FIGS. 74-77 and 79-83. Additionally, thearms may be configured to cut and scrape endplate tissue.

FIGS. 85 and 86 show another embodiment of a tissue disruption tool 550of the present disclosure. Tool 550 includes an elongated member 552that may be inserted through a cannula 554 in a straight configurationwherein at least the distal end portion 556 of the elongated 552 forms acurved configuration when it is advanced out of the cannula. In thisembodiment, the distal end portion includes a spoon-like scallop 558 fordisrupting tissue extending along the inner curved surface of the distalend portion 556. The upper and lower edges 557, 558 may be configured todisrupt endplate tissue.

FIG. 88 illustrates another embodiment of a tissue disruption tool 560of the present disclose. Tool 560 includes an elongated member 562 thathas a slight curved distal end portion 564 having a pointed tip 566. Theelongated member 562 may be passed through cannula 568 for insertioninto the disc space. When inserted, the slight curve may be in thedistal end portion 564 may be orientated so that the pointed tipcontacts the upper or lower endplate.

Any of the disruption surfaces and/or edges of the tissue disruptorsdisclosed herein may have any suitable edge or surface for disruptingtissue. The surface or edge may be sharp, beveled, serrated, scallopedor the like.

Although the present disclosure is described in light of the illustratedembodiments, it is understood that this for the purposes illustrationand not limitation. Other applications, modifications or use of thesupport or distraction device may be made without departing for thescope of this invention, as set forth in the claims now or hereafterfiled.

1-13. (canceled)
 14. A method for disrupting tissue in theintervertebral disc space, comprising: forming a barrier in theintervertebral disc space wherein the barrier at least partially definesa perimeter of a working region within the disc space; and disruptingtissue on only one side of the barrier and within the working region upto a distalmost tip of the barrier, without disrupting tissue beyond thedistalmost tip of the barrier.
 15. The method of claim 14 wherein thetissue within the perimeter comprises nucleus pulpous tissue, vertebralbody end plate tissue and/or annulus fibrosis tissue.
 16. The method ofclaim 14 wherein forming of the barrier comprises inserting a barrierinto the intervertebral disc space in a substantially linearconfiguration and changing the configuration of the barrier to agenerally arcuate configuration.
 17. The method of claim 16 wherein thegenerally arcuate configuration comprises a partial generally circularshape.
 18. The method of claim 16 wherein the generally arcuateconfiguration extends between about 270 degrees and about 355 degrees.19. The method of claim 14 wherein the barrier substantially completelysurrounds tissue to be disrupted.
 20. The method of claim 14 whereindisrupting tissue within the working region comprises inserting a tissuedisruption tool within the perimeter.
 21. The method of claim 14 whereindisrupting tissue within the perimeter comprises cutting, scraping,puncturing, brushing, tearing and/or extracting tissue.
 22. The methodof claim 14 wherein forming the barrier within the disc space isolatestissue to be disrupted from other tissue within the disc space. 23-40.(canceled)
 41. The method of claim 20, wherein the tissue disruptiontool is advanced along at least a portion of the barrier to disrupttissue within the working region.
 42. The method of claim 20, furthercomprising advancing a delivery cannula into the intervertebral discspace, the delivery cannula having the barrier and the tissue disruptiontool at least partially positioned therein, with the barrier in asubstantially linear configuration and the tissue disruption toolpositioned externally of the barrier, prior to advancing at least aportion of the barrier out of the delivery cannula to define theperimeter of the working region within the intervertebral disc space.43. The method of claim 42, wherein the delivery cannula includes firstand second lumens, with the barrier at least partially positioned withinone of the first and second lumens and the tissue disruption tool atleast partially positioned within the other one of the first and secondlumens.
 44. The method of claim 20, wherein the perimeter defined by thebarrier is generally circular and includes an open access regionconfigured for passage of the tissue disruption tool therethrough andinto the working region.
 45. The method of claim 20, wherein the tissuedisruption tool includes a distal end portion having a tissue disruptorassociated therewith.
 46. The method of claim 45, wherein the tissuedisruptor comprises one or more of sharp edges, jaws, and bristles. 47.The method of claim 45, wherein the tissue disruption tool comprises atleast one shaft, and the distal end portion of the tissue disruptiontool is connected to the shaft by a joint that allows the distal endportion of the tissue disruption tool to move relative to the shaft. 48.The method of claim 14, wherein the barrier comprises a ribbon ofmaterial.
 49. The method of claim 14, wherein the barrier is formed of ashape memory material.
 50. A method for disrupting tissue in theintervertebral disc space, comprising: advancing a delivery cannula intoan intervertebral disc space, the delivery cannula having a barriermember and a tissue disruption tool at least partially positionedtherein, with the barrier member in a first configuration and the tissuedisruption tool positioned externally of the barrier member; advancingat least a portion of the barrier member out of the delivery cannula andinto the intervertebral disc space in a second configuration to at leastpartially define a perimeter of a working region within theintervertebral disc space; and advancing at least a portion of thetissue disruption tool out of the delivery cannula and along said atleast a portion of the barrier member into the working region to disrupttissue on only one side of the barrier member, within the workingregion.
 51. A method for disrupting tissue in the intervertebral discspace, comprising: advancing a delivery cannula into an intervertebraldisc space, the delivery cannula having first and second lumens, with abarrier member at least partially positioned within one of the first andsecond lumens in a first configuration and a tissue disruption tool atleast partially positioned within the other one of the first and secondlumens; advancing at least a portion of the barrier member out of thedelivery cannula and into the intervertebral disc space in a secondconfiguration to at least partially define a perimeter of a workingregion within the intervertebral disc space; and advancing at least aportion of the tissue disruption tool out of the delivery cannula andalong said at least a portion of the barrier member into the workingregion to disrupt tissue on only one side of the barrier member, withinthe working region.